As with the EF 40mm f/2.8 STM prime, Roger has received quite a few samples of these new lenses. A normal part of LensRentals' procedure is to run new lenses through Imatest to establish a baseline for performance, before they can go out to rental customers. Although at this point the lenses will likely come from the same--or at least close--production batches, Roger's testing of multiple copies is helpful in that it reduces the impact of sample variation (and indeed, lets one get an idea of how much variation there is in a particular design.)

We won't spoil the verdict on the new lenses here, except to say that Roger considers both models to be "nice, sharp lenses". For more info, hop on over to the LensRentals blog and read today's post, "The 'Other' Canon Primes--Why Did They Do That?". (And if the new lenses picque your interest, perhaps consider renting them yourself, to see if they belong in your own lens stable.)